UPM-Kymmene has filed a patent for a polymeric film designed for release liners. The film consists of a polymeric support layer made of polyolefins and/or polyesters, and an extruded primer layer composed of a thermoplastic polymer bonded to functional vinyl groups. GlobalData’s report on UPM-Kymmene gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Polymeric film for release liner with functional vinyl groups
A recently filed patent (Publication Number: US20230312996A1) describes a polymeric film for a release liner and a method for manufacturing the film. The film consists of a polymeric support layer made of polyolefins and/or polyesters, and an extruded primer layer made of a thermoplastic polymer covalently bonded to functional vinyl groups. The film may also include a tie layer between the support layer and the primer layer.
The method for manufacturing the film involves extruding a molten composition of polyolefins and/or polyesters to form the support layer, and extruding a molten composition of a thermoplastic polymer covalently bonded to functional vinyl groups to form the primer layer. The temperatures of the extruded compositions are then allowed to decrease below their melting points to form the layers of the film. In some cases, a third composition containing a compatibilizer may be co-extruded to form a tie layer between the support layer and the primer layer.
The thermoplastic polymer covalently bonded to functional vinyl groups can be a reaction product of a molten thermoplastic and a grafting agent containing functional vinyl groups. It can also be formed from a thermoplastic poly(vinyl alcohol) (PVA) or contain ester bonded pendant chains that end into vinyl groups. The tie layer may be made of polyolefin grafted with maleic anhydride, acrylic acid, or glycidyl methacrylate.
The patent also mentions properties of the extruded primer layer, such as a PPS roughness value of less than 1 µm, a coat weight of at least 0.6 g/m2, and a minimum amount of functional vinyl groups. The polymeric support layer can be made of high density polyethylene (HDPE), polypropylene (PP), polybutylene, polyethylene terephthalate (PET), PET copolymers, or a combination of these materials.
The polymeric film described in the patent can be used as a release liner, which is a protective layer used in various industries. The film can be coated with a silicone layer to enhance its release properties.
In summary, the patent describes a polymeric film for a release liner and a method for manufacturing the film. The film consists of a polymeric support layer and an extruded primer layer, with the option of including a tie layer. The film is made using specific compositions and processes, and can be used in applications that require a release liner.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
